78440299 has 16 divisors (see below), whose sum is σ = 92097280. Its totient is φ = 65409120.

The previous prime is 78440291. The next prime is 78440357. The reversal of 78440299 is 99204487.

It is not a de Polignac number, because 78440299 - 2³ = 78440291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78440291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126412 + ... + 127030.

It is an arithmetic number, because the mean of its divisors is an integer number (5756080).

Almost surely, 2^78440299 is an apocalyptic number.

78440299 is a deficient number, since it is larger than the sum of its proper divisors (13656981).

78440299 is a wasteful number, since it uses less digits than its factorization.

78440299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 78440299 is about 8856.6528101761. The cubic root of 78440299 is about 428.0683120212.

The spelling of 78440299 in words is "seventy-eight million, four hundred forty thousand, two hundred ninety-nine".